Espérance Sportive Troyes Aube Champagne (ESTAC), commonly known as Troyes, is a French professional association football club based in Troyes that competes in Ligue 2. It plays its home matches at the Stade de l'Aube. Founded in 1986, it is the third professional club from the city, after AS Troyes-Savinienne and Troyes AF. The club is part of the City Football Group.

The first ever football club in Troyes was created in 1900, as Union Sportive Troyenne (UST). In 1931, it merged with the AS Savinienne, a club from the suburbs of Troyes, to form the Association Sportive Troyenne et Savinienne (ASTS). The newly formed club became professional in 1935, and joined Ligue 2. The club reached Première Division in 1954–55, under the guidance of manager and former international player Roger Courtois (1952–1963), with players such as Abdelaziz Ben Tifour, Marcel Artelesa or Pierre Flamion. It constituted one of the more glorious times for the club, as they reached the Coupe de France final in 1956, against Sedan, which they went on to lose 3–1. The same day, the youth team of the club won the Coupe Gambardella, the French Youth cup. That very same year, the club failed to keep its place in French top flight, and was back in Division 2. It finally succeed in reaching the Première Division again in 1960, but only lasted one season, and was relegated in 1961. The club had some financial difficulties, and had to leave professional football at the end of the 1962–63 season, which they finished 17th out of 20. They continued for four more seasons at regional level, under the guidance of former ASTS player Jacques Diebold, before disappearing.

Shortly after without any major club in Troyes, a new one was created in 1967, under the name Troyes Omnisports, still at regional level. It renamed itself Troyes Aube Football (TAF) in 1970 as it took back professional status, and was admitted to play in the Third Division. They were promoted to the Second Division after just one year. For their first season in Second division, under the lead of Pierre Flamion, they finished second, but failed to win promotion, as there were three Second division groups that season. They finished first next year, in 1973, and lost in the Champions final between the Champions of the two new groups against Lens. The club had its longest consecutive run in Ligue 1, as they stayed five consecutive seasons in the top flight, from 1973 to 1978. It was however a difficult spell, as it struggled each season against relegation. Pierre Flamion left in 1975, and was replaced by René Cédolin, former Rennes manager. Its best position was 15th out of 20 in 1976–77. Even though they had some very good players, such as striker Gérard Tonnel (1972–1975, 107 games, 69 goals in Ligue 1 and Ligue 2), right-back René Le Lamer (1973–1978), keeper Guy Formici (1970–1978) and Yugoslavian star, winger Ilija Petković (1973–1976). They were finally relegated in 1978, finishing 19th. They suffered back to back relegations finishing 17th in the second division and dropped to the third division. This led to the club becoming bankrupt and merging with Patronage Laïque de Troyes, leaving Troyes without a professional Football Club yet again.

After the death of the second professional club from Troyes, some people tried to rebuild a new club, which could be able to come back to professional status. At first, in 1979, just after the disappearing of the TAF, they merged the amateurs teams the TAF with the Patronage Laïque de Troyes, creating the PL Foot, once again under the guidance of Jacques Diebold. The club only managed to reach the Fourth division in 1984, but became relegated after just one season, finishing 17th. To build a more lasting club, Maurice Cacciaguerra, Angel Masoni and others decided to create the Association Troyes Aube Champagne (ATAC), taking the place of the PL Foot in Division d'Honneur, French sixth division, at regional level.

The new club won the championship in its first season, and was promoted to Fourth division in 1987. After just three seasons, they finished first of the Fourth Division in 1990, and reached the Third Division. Despite being well listed during the next three seasons, the club failed to gain promotion to the Second division. Due to the reform of French football leagues in 1993, the club was transferred to the newly formed Nationale 2, the new fourth level of French football. New president Angel Masoni called Alain Perrin to take the lead of the team. He was to become the most successful manager ever in Troyes, and stayed nine years, from 1993 to 2002. In his first year, he won the Nationale 2, and ATAC was promoted to the Nationale 1 in 1994. The following year, Troyes finished 10th, before finishing 2nd in 1995–96, and was promoted to Ligue 2: for the first time since 1979, Troyes were playing professional football.

Troyes first season was very difficult, as they finished 20th out of 22 teams, only keeping its place in Deuxième division due to the bankruptcy of Perpignan and Charleville. The next two seasons were much more successful, they finished fifth in 1997–98 and third in 1998–99, due to the presence of players more used to this level, such as Frédéric Adam, Richard Jeziersky, David Hamed, Samuel Boutal, fan favourite Slađan Đukić and local players, such as captain Mohammed Bradja. Troyes took the lead during the first part of the season. Even if the second part was more difficult, the team finished third, only on goal average, after a last win against Cannes. But most importantly Troyes was promoted to Ligue 1, 21 years after its last season at this level.

In Troyes' first season in Ligue 1 in 1999–2000, the team finished in 14th place, thereby avoiding relegation. At the end of the season, the name ATAC was changed to ESTAC due to the complaints of a French discount supermarket chain having the same name. The glory days came in the next two seasons, as they twice finished seventh, qualifying them for the first time in their history for the Intertoto Cup in 2001 and 2002. In 2001, with players Jérôme Rothen, Rafik Saïfi, Tony Heurtebis, Fabio Celestini and Nicolas Goussé in the side, they defeated Newcastle United in an epic Intertoto Cup second leg final, which finished 4–4 at St James' Park.

After a first round qualification in UEFA Cup over Slovakian MFK Ruzomberok (6–1; 0–1), Troyes lost to Leeds United 4–5 on aggregate despite winning the second leg 3–2, and failed to qualify to the third round. The following year, they beat Spanish side Villarreal, drawing 0–0 in the first leg and winning the second leg 2–1. However, the result was voided as Troyes fielded a disqualified player, David Vairelles. UEFA disqualified ESTAC, and Villarreal took their place instead. The sacking of new manager Jacky Bonnevay and the nomination of Faruk Hadzibegic in January did not save Troyes. They finished at the bottom of the Ligue 1, and were relegated to Ligue 2.